From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/c/string%2Fbyte%2Fmemccpy.html | 106 --------------------------------- 1 file changed, 106 deletions(-) delete mode 100644 devdocs/c/string%2Fbyte%2Fmemccpy.html (limited to 'devdocs/c/string%2Fbyte%2Fmemccpy.html') diff --git a/devdocs/c/string%2Fbyte%2Fmemccpy.html b/devdocs/c/string%2Fbyte%2Fmemccpy.html deleted file mode 100644 index a487a5ec..00000000 --- a/devdocs/c/string%2Fbyte%2Fmemccpy.html +++ /dev/null @@ -1,106 +0,0 @@ -

memccpy

Defined in header <string.h> 
void* memccpy( void* restrict dest, const void* restrict src, int c, size_t count );
-		 (since C23)

Copies bytes from the object pointed to by src to the object pointed to by dest, stopping after any of the next two conditions are satisfied:

-

The src and dest objects are interpreted as arrays of unsigned char.

-

The behavior is undefined if any condition is met:

-

Parameters

- - - - -
dest - pointer to the object to copy to
src - pointer to the object to copy from
c - terminating byte, converted to unsigned char at first
count - number of bytes to copy

Return value

If the byte (unsigned char)c was found, memccpy returns a pointer to the next byte in dest after (unsigned char)c. Otherwise it returns a null pointer.

-

Notes

The function is identical to the POSIX memccpy.

-

memccpy(dest, src, 0, count) behaves similar to strncpy(dest, src, count), except that the former returns a pointer to the end of the buffer written, and does not zero-pad the destination array. Thus, memccpy is useful for efficiently concatenating multiple strings.

-
char bigString[1000];
-char* end = bigString + sizeof bigString;
- 
-char* p = memccpy(bigString, "John, ", '\0', sizeof bigString - 1);
-if (p)
-    p = memccpy(p - 1, "Paul, ", '\0', end - p);
-if (p)
-    p = memccpy(p - 1, "George, ", '\0', end - p);
-if (p)
-    p = memccpy(p - 1, "Joel ", '\0', end - p);
-if (!p)
-    end[-1] = '\0';
- 
-puts(bigString); // John, Paul, George, Joel

Example

#include <ctype.h>
-#include <stdio.h>
-#include <string.h>
- 
-int main(void)
-{
-    const char src[] = "Stars: Altair, Sun, Vega.";
-    const char terminal[] = {':', ' ', ',', '.', '!'};
-    char dest[sizeof src];
-    const char alt = '@';
- 
-    for (size_t i = 0; i != sizeof terminal; ++i)
-    {
-        void* to = memccpy(dest, src, terminal[i], sizeof dest);
- 
-        printf("Terminal '%c' (%s):\t\"", terminal[i], to ? "found" : "absent");
- 
-        // if `terminal` character was not found - print the whole `dest`
-        to = to ? to : dest + sizeof dest;
- 
-        for (char* from = dest; from != to; ++from)
-            putchar(isprint(*from) ? *from : alt);
- 
-        puts("\"");
-    }
- 
- 
-    puts("\n" "Separate star names from distances (ly):");
-    const char *star_distance[] = {
-        "Arcturus : 37", "Vega : 25", "Capella : 43", "Rigel : 860", "Procyon : 11"
-    };
-    char names_only[64];
-    char *first = names_only;
-    char *last = names_only + sizeof names_only;
- 
-    for (size_t t = 0; t != (sizeof star_distance) / (sizeof star_distance[0]); ++t)
-    {
-        if (first)
-            first = memccpy(first, star_distance[t], ' ', last - first);
-        else
-            break;
-    }
- 
-    if (first)
-    {
-        *first = '\0';
-        puts(names_only);
-    }
-    else
-        puts("Buffer is too small.");
-}

Output:

-
Terminal ':' (found):   "Stars:"
-Terminal ' ' (found):   "Stars: "
-Terminal ',' (found):   "Stars: Altair,"
-Terminal '.' (found):   "Stars: Altair, Sun, Vega."
-Terminal '!' (absent):  "Stars: Altair, Sun, Vega.@"
- 
-Separate star names from distances (ly):
-Arcturus Vega Capella Rigel Procyon

See also

- - - - -
-
(C11)
 copies one buffer to another
(function)
-
(C95)(C11)
 copies a certain amount of wide characters between two non-overlapping arrays
(function)
-
(C11)
 moves one buffer to another
(function)
-
(C11)
 copies one string to another
(function)
-
(C11)
 concatenates two strings
(function)
-

- © cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
- https://en.cppreference.com/w/c/string/byte/memccpy -

-
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